Technology Standard :       Bluetooth CSR V2.0 Headset Chipset :     BlueCore4-Audio Single Chipset Bluetooth performance standard: Support Headset and Handsfree profile Transmitter power:       Class 2 Wireless frequency:        2.4 GHZ-2.480 GHZ Sensitive:     < -75 dBm Transmitter distance:      10M Power Parameter Charger power:      INPUT 100-240 VAC,OUTPUT 5 VDC Working volt:     3.7V Battery:     Rechargeable Li-Polymer battery Charging time:     2-5 hours Talking time:     4 hours Standby time:     110 hours Package Information Product size (mm):        33*216*18 Headset weight :        7 g Packaging:      Headset + USB cable +Earhook+Using guide + colour box